‘Welcome to 40 baby. I’ve celebrated 18 birthdays with you, and I can say it’s amazing growing up with you,’ he wrote on Instagram alongside pictures of them together and with their two young kids.

‘The person you have grown into is inspiring. You have become a successful business woman, superstar, dedicated mother, Philanthropist, supportive wife, wine maker, motorcycle mama, and amazing friend to all around you.’

‘I’m so proud of the woman you have become, and you are more beautiful than ever. You truly are like wine. You just keep getting better, and I’m so lucky to be along on this crazy ride with you.’

Pic: Getty

‘I love you baby. Looking forward many many more birthdays with you. I can’t wait to see how nuts you and I are in our 80’s 😂😂. Enjoy your day.’

The couple met in 2001 before Pink proposed in 2005 and a year later they tied the knot. Two years later, in 2008, they announced their separation.

However, in 2009 they rekindled their romance. And in June 2011, Hart and Pink welcomed their first child, a daughter named Willow Sage. They welcomed their second child in December 2016, a son called Jameson Moon.